Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at September 30, 2020 and December 31, 2019 was as follows (in millions): 

	September 30, 2020		December 31, 2019
Allegheny Technologies 5.875% Notes due 2023 (a)	$	500.0	$	500.0
Allegheny Technologies 5.875% Notes due 2027	350.0		350.0
Allegheny Technologies 3.5% Convertible Senior Notes due 2025	291.4		—
Allegheny Technologies 4.75% Convertible Senior Notes due 2022	84.2		287.5
Allegheny Ludlum 6.95% Debentures due 2025	150.0		150.0
Term Loan due 2024	200.0		100.0
U.S. revolving credit facility	—		—
Foreign credit facilities	4.2		4.9
Finance leases and other	25.6		18.8
Debt issuance costs	(15.2)		(12.3)
Equity component of convertible debt	(49.0)		—
Total debt	1,541.2		1,398.9
Short-term debt and current portion of long-term debt	12.2		11.5
Total long-term debt	$	1,529.0	$	1,387.4

(a) Bearing interest at 7.875% effective February 15, 2016.